3 v 1 1 D ec 1 99 9 Multidimensional Resonance Analysis of Λ + c → pK − π +
نویسندگان
چکیده
We present the results of a five-dimensional resonant amplitude analysis of the Λc →pK −π+ system based on 946 ± 38 reconstructed decays. These data were produced in 500 GeV/c π-N interactions by Fermilab experiment E791. We report measurements of the amplitudes for Λc decay into nonresonant pK −π+ and to pK ∗0 (890), ∆++(1232)K−, and Λ(1520)π+ and we comment on other possible resonant enhancements. This is the first complete amplitude analysis of the Λc →pK −π+ system. We find that (54.8 ± 5.5 ± 3.5)% of the decays are nonresonant, (19.5±2.6±1.8)% of the decays are via the K ∗0 resonance, (18.0±2.9±2.9)% of the decays are via the ∆++ resonance, and (7.7±1.8±1.1)% of the decays are via the Λ(1520) resonance. We find evidence for an increasingly negative polarization of the Λc baryons as a function of p 2 T , in agreement with a recent model[1] and with a related measurement[2].
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